Grill liner



FIG. 1 is a perspective view of a grill liner showing our new design, the broken line showing of a grill is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a top plan view, the bottom plan view being a mirror image thereof;

FIG. 3 is a right side view, the left side view being a mirror image thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a front view of the grill liner after removal from the grill. 

The ornamental design for a grill liner, as shown and described. 